Add a global on/off switch for content settings and expose a toggle on the Website Settings options…

chrome/browser/content_settings/host_content_settings_map.h

Index: chrome/browser/content_settings/host_content_settings_map.h
diff --git a/chrome/browser/content_settings/host_content_settings_map.h b/chrome/browser/content_settings/host_content_settings_map.h
index b5939b5fcaa726af32e01dda82859553ac1b17ad..654871279ce2097214906b3c37efa82409053c87 100644
--- a/chrome/browser/content_settings/host_content_settings_map.h
+++ b/chrome/browser/content_settings/host_content_settings_map.h
@@ -19,6 +19,7 @@
 #include "base/threading/platform_thread.h"
 #include "base/tuple.h"
 #include "chrome/browser/content_settings/content_settings_observer.h"
+#include "chrome/browser/content_settings/content_settings_override_provider.h"
 #include "chrome/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
 #include "components/content_settings/core/common/content_settings_types.h"
@@ -33,6 +34,7 @@ class Value;
 }
 
 namespace content_settings {
+class OverrideProvider;
 class ProviderInterface;
 class PrefProvider;
 }
@@ -97,9 +99,8 @@ class HostContentSettingsMap
   // setting, NULL is returned and the |source| field of |info| is set to
   // |SETTING_SOURCE_NONE|. The pattern fiels of |info| are set to empty
   // patterns.
-  // The ownership of the resulting |Value| is transfered to the caller.
   // May be called on any thread.
-  base::Value* GetWebsiteSetting(
+  scoped_ptr<base::Value> GetWebsiteSetting(
       const GURL& primary_url,
       const GURL& secondary_url,
       ContentSettingsType content_type,
@@ -248,6 +249,31 @@ class HostContentSettingsMap
       const ContentSettingsPattern& secondary_pattern,
       ContentSettingsType content_type);
 
+  // Returns the content setting without considering the global on/off toggle
+  // for the content setting that matches the URLs.
+  ContentSetting GetContentSettingWithoutOverride(
+      const GURL& primary_url,
+      const GURL& secondary_url,
+      ContentSettingsType content_type,
+      const std::string& resource_identifier);
+
+  // Returns the single content setting |value| without considering the
+  // global on/off toggle for the content setting that matches the given
+  // patterns.
+  scoped_ptr<base::Value> GetWebsiteSettingWithoutOverride(
+      const GURL& primary_url,
+      const GURL& secondary_url,
+      ContentSettingsType content_type,
+      const std::string& resource_identifier,
+      content_settings::SettingInfo* info) const;
+
+  // Sets globally if a given |content_type| |is_enabled|.
+  void SetContentSettingOverride(ContentSettingsType content_type,
+                                 bool is_enabled);
+
+  // Returns if a given |content_type| is enabled.
+  bool GetContentSettingOverride(ContentSettingsType content_type);
+
   // Adds/removes an observer for content settings changes.
   void AddObserver(content_settings::Observer* observer);
   void RemoveObserver(content_settings::Observer* observer);
@@ -314,6 +340,7 @@ class HostContentSettingsMap
   // time and by RegisterExtensionService, both of which should happen
   // before any other uses of it.
   ProviderMap content_settings_providers_;
+  content_settings::OverrideProvider override_;
 
   ObserverList<content_settings::Observer> observers_;